Our environment will be worse and worse unless something_______.A.was done B.is done
题目
Our environment will be worse and worse unless something_______.A.was done B.is done
Our environment will be worse and worse unless something_______.
A.was done B.is done C.will be done D.to be done
答案
选B
从句用一般现在时
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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